The commissioner said he had "no reason to believe that these officers acted inappropriately in any way," The Baltimore Sun reported.

The boy did not obey orders to stop from the officers, Davis said, and never dropped the "dead-on ringer" for a semi-automatic handgun.

Neither the boy nor the officer was identified. Davis said the teenager sustained non-life-threatening injures and is expected to fully recover.

The shooting happened as demonstrators on the other side of the city marked the one-year anniversary of Freddie Gray's funeral. The 25-year-old man died from critical spine injuries he suffered while being transported in the back of a police van.

Six officers have been charged in Gray's death. All have pleaded not guilty. A mistrial was declared in December for one of them, but charges have been refiled. The first of this year's trials begins in May.

Davis said the 13-year-old's mother was also questioned by officers because "she knew" he had left home with the fake gun.

"Those police officers had no way of knowing that it was not, in fact, an actual firearm. It looks like a firearm," said the commissioner.